Add actionAfterLoadRoutes in hook.xml

[jolelievre]

Questions	Answers
Branch?	8.1.x
Description?	Add actionAfterLoadRoutes in hook.xml
Type?	bug fix
Category?	IN
BC breaks?	no
Deprecations?	no
How to test?	~
UI Tests	~
Fixed issue or discussion?	~
Related PRs	~
Sponsor company	~

[prestonBot]

Hi, thanks for this contribution!

I found some issues with the Pull Request description:

• Your pull request does not seem to fix any issue, consider creating one (see note below) and linking it by writing Fixes #1234.

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